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      <ol class="breadcrumb"><li><a href="/">Home</a></li><li><a href='../'>Howl 0.4 Documentation</a></li><li>Spec</li><li>Spec - howl.signal</li></ol>
      <div class="spec-group spec-group-1">&#x000A;&#x000A;<h1 id="howl.signal">howl.signal</h1>&#x000A;&#x000A;<h4 id=".all-contains-all-registered-signals">.all contains all registered signals</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">signal</span><span class="p">.</span><span class="n">register</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="ss">description:</span><span class="w"> </span><span class="s1">'bar'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">same</span><span class="w"> </span><span class="ss">description:</span><span class="w"> </span><span class="s1">'bar'</span><span class="p">,</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">all</span><span class="p">.</span><span class="n">foo</span></pre>&#x000A;<div class="spec-group spec-group-2">&#x000A;&#x000A;<h2 id=".register">.register<span class="arg-list">(name, options)</span></h2>&#x000A;&#x000A;<h4 id="raises-an-error-if-mandatory-fields-are-missing">raises an error if mandatory fields are missing</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">assert</span><span class="p">.</span><span class="n">raises</span><span class="w"> </span><span class="s1">'description'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">register</span><span class="w"> </span><span class="s1">'foo'</span></pre>&#x000A;</div>&#x000A;<div class="spec-group spec-group-2">&#x000A;&#x000A;<h2 id=".unregister">.unregister<span class="arg-list">(name)</span></h2>&#x000A;&#x000A;<h4 id="unregisters-the-specified-signal">unregisters the specified signal</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">signal</span><span class="p">.</span><span class="n">register</span><span class="w"> </span><span class="s1">'frob'</span><span class="p">,</span><span class="w"> </span><span class="ss">description:</span><span class="w"> </span><span class="s1">'bar'</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">unregister</span><span class="w"> </span><span class="s1">'frob'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">is_nil</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">all</span><span class="p">.</span><span class="n">frob</span></pre>&#x000A;</div>&#x000A;<div class="spec-group spec-group-2">&#x000A;&#x000A;<h3 id=""><span class="arg-list">(trying to use a non-registered signal)</span></h3>&#x000A;&#x000A;<h4 id="emit-raises-an-error">emit raises an error</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">assert</span><span class="p">.</span><span class="n">raises</span><span class="w"> </span><span class="s1">'none'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'none'</span></pre>&#x000A;&#x000A;<h4 id="connect-raises-an-error">connect raises an error</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">assert</span><span class="p">.</span><span class="n">raises</span><span class="w"> </span><span class="s1">'none'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'none'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">true</span></pre>&#x000A;</div>&#x000A;<div class="spec-group spec-group-2">&#x000A;&#x000A;<h3 id=""><span class="arg-list">(with a registered signal)</span></h3>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">before_each</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">register</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="ss">description:</span><span class="w"> </span><span class="s1">'bar'</span><span class="w">&#x000A;</span><span class="n">after_each</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">unregister</span><span class="w"> </span><span class="s1">'foo'</span></pre>&#x000A;&#x000A;<h4 id="allows-name-based-signals-to-be-broadcasted-to-any-number-of-handlers">allows name based signals to be broadcasted to any number of handlers</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">handler1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">nil</span><span class="w">&#x000A;</span><span class="n">handler2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">nil</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler1</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler2</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">spy</span><span class="p">(</span><span class="n">handler1</span><span class="p">).</span><span class="n">was_called</span><span class="o">!</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">spy</span><span class="p">(</span><span class="n">handler2</span><span class="p">).</span><span class="n">was_called</span><span class="o">!</span></pre>&#x000A;&#x000A;<h4 id="allows-connecting-handlers-before-existing-handlers">allows connecting handlers before existing handlers</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">nil</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'first'</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="o">-&gt;</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'second'</span><span class="p">),</span><span class="w"> </span><span class="mi">1</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">equal</span><span class="w"> </span><span class="n">value</span><span class="p">,</span><span class="w"> </span><span class="s1">'first'</span></pre>&#x000A;&#x000A;<h4 id="allows-disconnecting-handlers">allows disconnecting handlers</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">handler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">true</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">disconnect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">spy</span><span class="p">(</span><span class="n">handler</span><span class="p">).</span><span class="n">was</span><span class="p">.</span><span class="n">not_called</span><span class="o">!</span></pre>&#x000A;<div class="spec-group spec-group-3">&#x000A;&#x000A;<h3 id=".emit">.emit</h3>&#x000A;&#x000A;<h4 id="raises-an-error-when-called-with-more-than-two-parameters">raises an error when called with more than two parameters</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">assert</span><span class="p">.</span><span class="n">raises</span><span class="w"> </span><span class="s1">'parameter'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="p">{},</span><span class="w"> </span><span class="mi">2</span></pre>&#x000A;&#x000A;<h4 id="raises-an-error-when-the-second-parameter-is-not-a-table">raises an error when the second parameter is not a table</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">assert</span><span class="p">.</span><span class="n">raises</span><span class="w"> </span><span class="s1">'table'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span></pre>&#x000A;&#x000A;<h4 id="returns-false-if-no-handlers-returned-true">returns false if no handlers returned true</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">assert</span><span class="p">.</span><span class="n">is_false</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="s1">'this is fortunately not true'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">is_false</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span></pre>&#x000A;&#x000A;<h4 id="invokes-all-handlers-in-their-own-coroutines">invokes all handlers in their own coroutines</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">coros</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{}</span><span class="w">&#x000A;</span><span class="n">coro_register</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">-&gt;</span><span class="w">&#x000A;  </span><span class="n">co</span><span class="p">,</span><span class="w"> </span><span class="n">main</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">coroutine.running</span><span class="o">!</span><span class="w">&#x000A;  </span><span class="n">coros</span><span class="p">[</span><span class="n">co</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">true</span><span class="w"> </span><span class="k">unless</span><span class="w"> </span><span class="n">main</span><span class="w">&#x000A;&#x000A;</span><span class="n">handler1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="n">coro_register</span><span class="w">&#x000A;</span><span class="n">handler2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="n">coro_register</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler1</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler2</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">equal</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="o">#</span><span class="p">[</span><span class="n">v</span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="n">_</span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="nb">pairs</span><span class="w"> </span><span class="n">coros</span><span class="p">]</span></pre>&#x000A;<div class="spec-group spec-group-4">&#x000A;&#x000A;<h3 id=""><span class="arg-list">(when a handler returns .abort)</span></h3>&#x000A;&#x000A;<h4 id="skips-invoking-subsequent-handlers">skips invoking subsequent handlers</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">handler2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">true</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">abort</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler2</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">spy</span><span class="p">(</span><span class="n">handler2</span><span class="p">).</span><span class="n">was</span><span class="p">.</span><span class="n">not_called</span><span class="o">!</span></pre>&#x000A;&#x000A;<h4 id="returns-.abort">returns .abort</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">abort</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">equals</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">abort</span><span class="p">,</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span></pre>&#x000A;</div>&#x000A;<div class="spec-group spec-group-4">&#x000A;&#x000A;<h3 id=""><span class="arg-list">(when a handler raises an error)</span></h3>&#x000A;&#x000A;<h4 id="logs-an-error-message">logs an error message</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="nb">error</span><span class="w"> </span><span class="s1">'BOOM'</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">match</span><span class="w"> </span><span class="n">log</span><span class="p">.</span><span class="n">last_error</span><span class="p">.</span><span class="n">message</span><span class="p">,</span><span class="w"> </span><span class="s1">'BOOM'</span></pre>&#x000A;&#x000A;<h4 id="continues-processing-subsequent-handlers">continues processing subsequent handlers</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">handler2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">true</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="nb">error</span><span class="w"> </span><span class="s1">'BOOM'</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler2</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">spy</span><span class="p">(</span><span class="n">handler2</span><span class="p">).</span><span class="n">was_called</span><span class="o">!</span></pre>&#x000A;</div>&#x000A;<div class="spec-group spec-group-4">&#x000A;&#x000A;<h3 id=""><span class="arg-list">(when a handler yields)</span></h3>&#x000A;&#x000A;<h4 id="continues-on-invoking-subsequent-handlers">continues on invoking subsequent handlers</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">handler2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spy</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="kc">true</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="nb">coroutine.yield</span><span class="w"> </span><span class="kc">false</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="n">handler2</span><span class="w">&#x000A;</span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">spy</span><span class="p">(</span><span class="n">handler2</span><span class="p">).</span><span class="n">was_called</span><span class="o">!</span></pre>&#x000A;&#x000A;<h4 id="returns-false">returns false</h4>&#x000A;&#x000A;<pre class="highlight moonscript"><span class="n">signal</span><span class="p">.</span><span class="n">connect</span><span class="w"> </span><span class="s1">'foo'</span><span class="p">,</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="nb">coroutine.yield</span><span class="w"> </span><span class="kc">true</span><span class="w">&#x000A;</span><span class="n">assert</span><span class="p">.</span><span class="n">is_false</span><span class="w"> </span><span class="n">signal</span><span class="p">.</span><span class="n">emit</span><span class="w"> </span><span class="s1">'foo'</span></pre>&#x000A;</div>&#x000A;</div>&#x000A;</div>&#x000A;</div>
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